594
FNCA52 TJSJ 100920
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
520 AM AST WED DEC 10 2025
DISCUSSION
TODAY, BREEZY TO WINDY CONDITIONS ARE EXPECTED ACROSS THE ISLANDS,
WITH EASTERLY WINDS BETWEEN 10 - 15 MPH, UP TO 19 - 20 MPH IN
LOCALIZED AREAS WITH GUSTS BETWEEN 20 - 23 MPH. A TRADE WIND
PERTURBATION MOVING ACROSS THE LOCAL ISLANDS WILL CONTINUE TO BRING
SHOWERS ACROSS PORTIONS OF EASTERN/SOUTHEASTERN PUERTO RICO AND
THE U.S. VIRGIN ISLANDS THROUGHOUT THE DAY. ALTHOUGH THE 24 HOUR
RELATIVE TREND SUGGEST AREAS JUST BELOW THRESHOLDS (BETWEEN 53 AND
55 %), KDBI VALUES AND SOIL SATURATIONS DO NOT MEET FIRE WEATHER
CRITERIA. HENCE, THE FIRE DANGER THREAT WILL REMAIN LOW FOR TODAY.
UPDATES TO THE FIRE WEATHER FORECAST WILL BE MADE IF REQUIRED.
PRZ014-110930-
SOUTHEAST COASTAL PLAINS-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 20
TEMP (24H TREND) 86 (+1) 71 (0) 86
RH % (24H TREND) 56 (-7) 94 (+4) 50
WIND 20FT/EARLY(MPH) E 14 G20 E 12 SE 16 G21
WIND 20FT/LATE(MPH) E 14 G20 E 12 SE 16 G21
MIXING HGT(FT-AGL/MSL)4060 4170
TRANSPORT WND (MPH) E 15 SE 18
VENT RATE (KT-FT) 52780 66720
DISPERSION 5 5
DSI 5 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-110930-
SOUTHERN HILLS-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 10
TEMP (24H TREND) 84 (+4) 67 (-1) 84
RH % (24H TREND) 66 (-7) 99 (+5) 63
WIND 20FT/EARLY(MPH) E 13 E 13 SE 13
WIND 20FT/LATE(MPH) E 13 E 13 SE 13
MIXING HGT(FT-AGL/MSL)4480 4600
TRANSPORT WND (MPH) E 15 SE 17
VENT RATE (KT-FT) 58240 69000
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-110930-
NORTH COASTAL PLAINS-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 30 10
TEMP (24H TREND) 87 (0) 69 (-1) 89
RH % (24H TREND) 65 (-1) 100 (+2) 56
WIND 20FT/EARLY(MPH) E 16 G18 E 12 E 13
WIND 20FT/LATE(MPH) E 16 G18 E 12 E 13
MIXING HGT(FT-AGL/MSL)4020 5570
TRANSPORT WND (MPH) E 16 SE 15
VENT RATE (KT-FT) 56280 72410
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-110930-
NORTHERN HILLS-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 20
TEMP (24H TREND) 86 (+1) 67 (0) 87
RH % (24H TREND) 64 (-2) 98 (0) 56
WIND 20FT/EARLY(MPH) E 12 E 9 E 12
WIND 20FT/LATE(MPH) E 12 E 9 E 12
MIXING HGT(FT-AGL/MSL)4390 5520
TRANSPORT WND (MPH) E 13 SE 14
VENT RATE (KT-FT) 48290 66240
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-110930-
WEST COAST-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 88 (+2) 70 (+1) 88
RH % (24H TREND) 63 (-6) 97 (+1) 59
WIND 20FT/EARLY(MPH) SE 12 E 12 SE 16 G18
WIND 20FT/LATE(MPH) SE 12 E 12 SE 16 G18
MIXING HGT(FT-AGL/MSL)3480 4620
TRANSPORT WND (MPH) E 9 SE 17
VENT RATE (KT-FT) 27840 69300
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-110930-
EASTERN INTERIOR-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 60 30
TEMP (24H TREND) 85 (+2) 69 (0) 85
RH % (24H TREND) 69 (-2) 100 (+1) 62
WIND 20FT/EARLY(MPH) SE 16 E 14 SE 12
WIND 20FT/LATE(MPH) SE 16 E 14 SE 12
MIXING HGT(FT-AGL/MSL)4110 4560
TRANSPORT WND (MPH) E 17 SE 17
VENT RATE (KT-FT) 61650 68400
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-110930-
LUQUILLO MOUNTAIN RANGE-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 60 40
TEMP (24H TREND) 80 (+2) 66 (-2) 81
RH % (24H TREND) 76 (-1) 100 (0) 70
WIND 20FT/EARLY(MPH) SE 14 E 11 SE 11
WIND 20FT/LATE(MPH) SE 14 E 11 SE 11
MIXING HGT(FT-AGL/MSL)2900 4080
TRANSPORT WND (MPH) E 22 SE 17
VENT RATE (KT-FT) 55100 61200
DISPERSION 5 5
DSI 5 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-110930-
CENTRAL MOUNTAIN RANGE-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 30
TEMP (24H TREND) 84 (+5) 66 (0) 84
RH % (24H TREND) 65 (-8) 98 (+2) 60
WIND 20FT/EARLY(MPH) SE 9 E 6 SE 11
WIND 20FT/LATE(MPH) SE 9 E 6 SE 11
MIXING HGT(FT-AGL/MSL)4810 5250
TRANSPORT WND (MPH) E 12 SE 16
VENT RATE (KT-FT) 48100 73500
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-110930-
CAYEY MOUNTAIN RANGE-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 60 40
TEMP (24H TREND) 80 (+2) 67 (0) 80
RH % (24H TREND) 77 (0) 100 (0) 70
WIND 20FT/EARLY(MPH) E 12 E 11 SE 11
WIND 20FT/LATE(MPH) E 12 E 11 SE 11
MIXING HGT(FT-AGL/MSL)3590 4230
TRANSPORT WND (MPH) E 18 SE 17
VENT RATE (KT-FT) 57440 63450
DISPERSION 5 5
DSI 5 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-110930-
VIEQUES-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 60 50
TEMP (24H TREND) 86 (0) 72 (-1) 86
RH % (24H TREND) 65 (+3) 99 (+1) 60
WIND 20FT/EARLY(MPH) E 18 G23 E 18 G22 E 13
WIND 20FT/LATE(MPH) E 18 G23 E 18 G22 E 13
MIXING HGT(FT-AGL/MSL)2860 3560
TRANSPORT WND (MPH) E 23 SE 17
VENT RATE (KT-FT) 57200 53400
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-110930-
CULEBRA-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 60 50
TEMP (24H TREND) 87 (+1) 73 (-2) 87
RH % (24H TREND) 63 (0) 100 (+6) 59
WIND 20FT/EARLY(MPH) E 19 G23 E 18 G22 SE 13 G17
WIND 20FT/LATE(MPH) E 19 G23 E 18 G22 SE 13 G17
MIXING HGT(FT-AGL/MSL)3010 3630
TRANSPORT WND (MPH) E 23 SE 17
VENT RATE (KT-FT) 60200 54450
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-110930-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 20 10
TEMP (24H TREND) 89 (+3) 71 (-1) 89
RH % (24H TREND) 53 (-7) 90 (0) 48
WIND 20FT/EARLY(MPH) E 17 G23 E 17 G21 E 20 G27
WIND 20FT/LATE(MPH) E 17 G23 E 17 G21 E 20 G27
MIXING HGT(FT-AGL/MSL)4340 4480
TRANSPORT WND (MPH) E 15 E 22
VENT RATE (KT-FT) 56420 85120
DISPERSION 5 5
DSI 5 5 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-110930-
SAINT THOMAS AND SAINT JOHN-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 50 50
TEMP (24H TREND) 86 (+1) 72 (-3) 86
RH % (24H TREND) 66 (+2) 100 (+6) 63
WIND 20FT/EARLY(MPH) E 19 G24 E 19 G23 SE 14 G19
WIND 20FT/LATE(MPH) E 19 G24 E 19 G23 SE 14 G19
MIXING HGT(FT-AGL/MSL)2980 3490
TRANSPORT WND (MPH) E 26 SE 26
VENT RATE (KT-FT) 68540 80270
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-110930-
ST CROIX-
520 AM AST WED DEC 10 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 30
TEMP (24H TREND) 86 (+1) 73 (-2) 86
RH % (24H TREND) 67 (+4) 97 (+2) 64
WIND 20FT/EARLY(MPH) E 19 G23 E 17 G20 E 14 G18
WIND 20FT/LATE(MPH) E 19 G23 E 17 G20 E 14 G18
MIXING HGT(FT-AGL/MSL)3360 3880
TRANSPORT WND (MPH) E 25 E 20
VENT RATE (KT-FT) 73920 65960
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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